1 /*

     2  * reserved comment block

     3  * DO NOT REMOVE OR ALTER!

     4  */

     5 /*

     6  * Copyright 2001-2004 The Apache Software Foundation.

     7  *

     8  * Licensed under the Apache License, Version 2.0 (the "License");

     9  * you may not use this file except in compliance with the License.

    10  * You may obtain a copy of the License at

    11  *

    12  *     http://www.apache.org/licenses/LICENSE-2.0

    13  *

    14  * Unless required by applicable law or agreed to in writing, software

    15  * distributed under the License is distributed on an "AS IS" BASIS,

    16  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

    17  * See the License for the specific language governing permissions and

    18  * limitations under the License.

    19  */

    20 /*

    21  * $Id: PositionCall.java,v 1.2.4.1 2005/09/02 11:17:10 pvedula Exp $

    22  */

    23 

    24 package com.sun.org.apache.xalan.internal.xsltc.compiler;

    25 

    26 import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;

    27 import com.sun.org.apache.bcel.internal.generic.ILOAD;

    28 import com.sun.org.apache.bcel.internal.generic.INVOKEINTERFACE;

    29 import com.sun.org.apache.bcel.internal.generic.InstructionList;

    30 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;

    31 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.CompareGenerator;

    32 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;

    33 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TestGenerator;

    34 

    35 /**

    36  * @author Jacek Ambroziak

    37  * @author Santiago Pericas-Geertsen

    38  * @author Morten Jorgensen

    39  */

    40 final class PositionCall extends FunctionCall {

    41 

    42     public PositionCall(QName fname) {

    43         super(fname);

    44     }

    45 

    46     public boolean hasPositionCall() {

    47         return true;

    48     }

    49 

    50     public void translate(ClassGenerator classGen, MethodGenerator methodGen) {

    51         final InstructionList il = methodGen.getInstructionList();

    52 

    53         if (methodGen instanceof CompareGenerator) {

    54             il.append(((CompareGenerator)methodGen).loadCurrentNode());

    55         }

    56         else if (methodGen instanceof TestGenerator) {

    57             il.append(new ILOAD(POSITION_INDEX));

    58         }

    59         else {

    60             final ConstantPoolGen cpg = classGen.getConstantPool();

    61             final int index = cpg.addInterfaceMethodref(NODE_ITERATOR,

    62                                                        "getPosition",

    63                                                        "()I");

    64 

    65             il.append(methodGen.loadIterator());

    66             il.append(new INVOKEINTERFACE(index,1));

    67         }

    68     }

    69 }